
Algebra PreAlgebra and Basic Algebra Math Forum 
 LinkBack  Thread Tools  Display Modes 
September 14th, 2017, 10:44 PM  #1 
Newbie Joined: Sep 2017 From: Oregon Posts: 1 Thanks: 0  Need help with a math problem.
In math class this problem plz explain how to solve and what work you did. X=9 x^2+3 X^2 is my way of saying x is squared. 
September 14th, 2017, 10:58 PM  #2 
Senior Member Joined: May 2016 From: USA Posts: 997 Thanks: 410 
Is the problem $x = \ 9 + x^2 + 3$ or $x = \ 9x^2 + 3$? There are FOUR methods to solve quadratic equations. Which ones have you been taught so far? It is hard to help when you tell us nothing about what you have tried or even thought about. 
September 15th, 2017, 04:34 AM  #3 
Math Team Joined: Jan 2015 From: Alabama Posts: 3,102 Thanks: 850 
The simplest thing to do is to use the "quadratic formula". Given a general quadratic equation, $\displaystyle ax^2+ bx+ c= 0$, you can apply "completing the square" to it to get $\displaystyle x= \frac{b\pm\sqrt{b^2 4ac}}{2a}$. Here 9x^2+ x= 3 is the same as 9x^2+ x 3= 0 so a= 9, b= 1, and c= 3. So $\displaystyle x= \frac{1\pm\sqrt{(1)^2 4(9)(3)}}{2(9)}= \frac{1\pm\sqrt{109}}{18}$.

September 15th, 2017, 05:06 AM  #4 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 12,124 Thanks: 800  

Tags 
math, problem 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
math problem  tongass  Elementary Math  6  December 6th, 2016 03:07 AM 
math problem  ariorakip  Elementary Math  4  November 1st, 2015 10:27 AM 
can somebody help me with this math problem?  mathstudent  Algebra  2  April 17th, 2010 10:37 AM 
Math Problem!  caitz  Algebra  2  September 23rd, 2009 10:30 PM 
Easy problem in turkey math olympiad problem  codename211  Math Events  11  August 8th, 2007 07:30 PM 